<template>
  <div class="goods">
    <div class="wrap">
      <Crumb> </Crumb>
      <img src="../assets/img/banner.4c6b6225.png" width="100%" alt="" />
      <ul class="options">
        <li>
          <strong>排序：</strong>
          <span
            :class="{ active: index == options1Index }"
            v-for="(item, index) in options1"
            :key="index"
            @click="options1Fn(index, item.min, item.max)"
            >{{ item.txt }}</span
          >
        </li>
        <li>
          <strong>分类：</strong>
          <span
            :class="{ active: index == options2Index }"
            v-for="(item, index) in options2"
            :key="index"
            @click="options2Fn(index, item.type)"
            >{{ item.txt }}</span
          >
        </li>
      </ul>
      <List :arr="goodsListShow" />
      <div v-show="!isReachBottom">
        <i class="iconfont icon-loading loading"></i>
        loading...
      </div>
      <div v-show="isReachBottom">加载完毕</div>
    </div>
  </div>
</template>                            
<script>
import Crumb from "../components/Crumb.vue";
import List from "../components/home/List.vue";
import { GoodsSearchAPI } from "@/request/api";
import { getScrollTop, getClientHeight, getScrollHeight } from "@/utils";
export default {
  data() {
    return {
      goodsList: [],
      goodsListShow: [],
      // 栏目
      did: 0,
      // 实体产品 1 虚拟 2 全部 0
      type: 0,
      // min 最小积分
      min: 0,
      // 最大积分 如果为0 会忽略其他的逻辑
      max: 100000,
      // 关键字
      keyword: "",
      options1: [
        { min: 0, max: 0, txt: "全部" },
        { min: 0, max: 0, txt: "我还可以兑换" },
        { min: 0, max: 500, txt: "0-500分" },
        { min: 500, max: 1000, txt: "500-1000分" },
        { min: 1000, max: 1500, txt: "1000-1500分" },
        { min: 1500, max: 2500, txt: "1500-2500分" },
        { min: 2500, max: 6500, txt: "2500-6500分" },
        { min: 6500, max: 10000, txt: "6500-10000分" },
      ],
      options2: [
        { txt: "全部", type: 0 },
        { txt: "实物礼品", type: 1 },
        { txt: "虚拟礼品", type: 2 },
      ],
      options1Index: 0,
      options2Index: 0,
      page: 1,
      size: 8,
      isLoading: false,
      isReachBottom: false,
    };
  },
  components: {
    Crumb,
    List,
  },
  created() {
    let keyword = this.$route.query.keyword;
    keyword ||= "";
    console.log("接收到的参数为", keyword);
    this.keyword = keyword;
    this.goodsSearch();
  },
  mounted() {
    window.addEventListener("scroll", this.scrollFn);
  },
  beforeDestroy() {
    window.removeEventListener("scroll", this.scrollFn);
  },
  methods: {
    async goodsSearch() {
      let res = await GoodsSearchAPI({
        did: this.did,
        type: this.type,
        min: this.min,
        max: this.max,
        keyword: this.keyword,
      });
      console.log(res);
      this.goodsList = res.data;
      this.goodsListShow = this.goodsList.filter(
        (item, index) => index < this.size
      );

      this.page = 1;
      this.isReachBottom = false;
      if (this.goodsListShow.length == this.goodsList.length) {
        this.isReachBottom = true;
        return;
      }
    },
    options1Fn(idx, min, max) {
      this.options1Index = idx;
      this.min = min;
      this.max = max;
      this.goodsSearch();
    },
    options2Fn(idx, type) {
      this.options2Index = idx;
      this.type = type;
      this.goodsSearch();
    },
    scrollFn() {
      console.log(
        "滚动了",
        getScrollTop(),
        getClientHeight(),
        getScrollHeight()
      );
      if (getClientHeight() + getScrollTop() > getScrollHeight() - 240) {
        if (this.goodsListShow.length == this.goodsList.length) {
          this.isReachBottom = true;
          return;
        }
        if (this.isLoading == false) {
          this.isLoading = true;
          console.log("准备加载下一页...");
          this.page++;

          setTimeout(() => {
            console.log("请求.....");
            for (
              let i = (this.page - 1) * this.size;
              i < this.size * this.page;
              i++
            ) {
              console.log("for:i", this.page, i, this.goodsList[i]);
              // if (this.goodsList[i]) {
              //   this.goodsListShow.push(this.goodsList[i]);
              // }
              // && 一假全假
              this.goodsList[i] && this.goodsListShow.push(this.goodsList[i]);
            }
            this.isLoading = false; // 加载完毕，===没有在加载数据
          }, 2000);
        }
      }
    },
  },
  watch: {
    "$route.query.keyword": {
      handler(newVal, oldVal) {
        console.log(newVal, oldVal);
        this.keyword = newVal;
        this.goodsSearch();
      },
    },
  },
};
</script>
 
<style lang = "less" scoped>
@import "../assets/css/public.less";

.goods {
  padding-bottom: 50px;
  background: #efefef;
  padding-top: 20px;
  .options {
    padding-top: 20px;
    padding-bottom: 40px;
    li {
      margin-top: 20px;
      strong {
        color: #000;
        font-weight: bold;
      }
      span {
        margin-right: 20px;
        margin-left: 10px;
        cursor: pointer;
        color: #999;
        &.active {
          color: @base-color;
          font-weight: bold;
        }
      }
    }
  }
  .loading {
    display: inline-block;
    animation: myloading forwards 1s linear infinite;
  }
}

@keyframes myloading {
  0% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(360deg);
  }
  100% {
    transform: rotate(720deg);
  }
}
</style>